Tractor



FIG. 1 is a top perspective view of a tractor showing our new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a bottom plan view thereof;

FIG. 6 is a left side view thereof; and,

FIG. 7 is a right side view thereof.

The broken lines in the Figures show portions of the tractor that form no part of the claimed design.

The gray shading in the Figures shows portions of the tractor that contain outside air inlets and not surface ornamentation. 

CLAIM The ornamental design for a tractor, as shown and described. 